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TDA7306 digital controlled stereo audio processor advance data control is accomplished by mi- crowire/spi - compatible serial bus interface input and output pins for external equalizer three stereo input source selec- tion plus mono input treble, bass, volume and balance control four independent speaker control (front/rear) single supply operation very low noise and very low dis- tortion pop free switching description the TDA7306 is a volume, tone (bass and treble), balance (left/right) and fader (front/rear) proces- sor for high quality audio applications in car radio and hi-fi systems. the ac signal setting is obtained by resistor net- works and analog switches combined with opera- tional amplifiers. the results are: low noise, low distortion and high dynamic range. this is advancedinformation on a new product now in developmentor undergoing evaluation. details are subjectto change without notice. notice. may 1991 block diagram dip28 ordering number: TDA7306 1/13
absolute maximum ratings symbol parameter value unit v s supply voltage 14 v p tot total power dissipation (t amb =25 c) 2 w t amb operating ambient temperature range -40 to +85 c t stg storage temperature -40 to 150 c thermal data symbol description value unit r th j-pins thermal resistance junction-pins max 65 c/w electrical characteristics (t amb =25 c, v s= 10v , r l = 10k w ;r g = 600 w , f = 1khz unless otherwise specified) symbol parameter test condition min. typ. max. unit supply v s supply voltage 6 10 14 v i s supply current 15 30 40 ma svr ripple rejection f = 300hz to 10khz 50 60 db input selectors r i input resistance 30 45 k w v i (dc) input dc voltage 3.5 4.3 5 v v in max max. input signal gv = 0db d = 0.3% 1.5 2.0 vrms in s input separation f = 1khz (2) 90 100 db f = 10khz (2) 70 80 db r l output load resistance 5 k w pin connection (top view) TDA7306 2/13
electrical characteristics (continued) symbol parameter test condition min. typ. max. unit volume controls r in input resistance 10 18 26 k w control range 78 db g max max gain 8 10 12 db max attenuation 48 52.4 db step resolution 1.6 2.5 db attenuator set error g v = -50 to 10db 2 db tracking error 2db speaker attenuators control range 38 41 44 db step resolution see note (3) attenuator set error 3 db tracking error 2db bass and treble control (1) control range 15 db step resolution 2.5 3.5 db audio output v o max. output voltage d = 0.3% 1.5 2.2 vrms r l output load resistance 2 k w c l output load capacitance 1 nf r o output resistance 70 150 w v o (dc) dc voltage level 3 3.8 4.5 v general e no output noise bw = 22hz g v = 0db to 22khz out atten. > 20db 615 m v 3.5 g v = 0db curve a 4 s/n signal to noise ratio all gain = 0db v o = 1vrms bw = 22hz to 22khz 105 db d distortion f = 1khz; v o = 1v; g v = 0 0.01 0.1 % frequency response (-1db) g v = 0 high low 20 20 khz hz s c channnel separation left/right f = 1khz f = 10khz 90 70 100 80 db db bus inputs v il input low voltage 0.8 v v ih input high voltage 2.4 v digital input current -5 +5 m a notes: (1) bass and treble response see attached diagram. the center frequency and quality of the resonance behaviour can be choosen by the external circuitry. a standard first order bass response can be realized by a standard feedback network. (2) the selected input is grounded thru the 2.2 m f capacitor. (3) see speaker attenuators table on osoftware specificationo. TDA7306 3/13
figure 1: application circuit TDA7306 4/13
figure 2: p.c. board and components layout of the fig.1 (1:1 scale) TDA7306 5/13
figure 3: total output noise vs. volume setting figure 5: distortion + noise vs. frequency figure 7: distortion vs. load resistance figure 4: signal to noise ratio vs. volume setting figure 6: distortion vs. output voltage figure 8: channel separation (l1 - r1) vs. frequency g v =0db TDA7306 6/13
application information volume control concept traditional electronic volume control circuits use a multiplier technique with all the disadvantages of high noise and distortion. the used concept, as shown in fig. 12 with digital switched resistor dividers, provides extremely low noise and distortion. the multiplexing of the resis- tive dividers is realized with a multiple-input op- erational amplifier. bass and treble control the principle operation of the bass control is shown in fig. 13. the external filter together with the internal buffer allows a flexible filter design ac- cording to the different requirements in car radios. the function of the treble is similar to the bass. a typical curve is shown in fig.14. figure 9: input separation (l1 - l2) vs. frequency figure 10: supplyvoltage rejection vs. frequency figure 11: quiescent current vs. temperature figure 12: volume control figure 13: bass control TDA7306 7/13
application information (continued) outputs a special class-a output amplifier with a modu- lated sink current provides low distortion and ground compatibility with low current consumption. figure 14: typical tone response figure 15: complete car-radio system using digital controlled audio processor TDA7306 8/13
application information (continued) serial bus interface the serial bus interface is compatible to mi- crowire and spi bus systems. during the low state of the chip enable signal (ce) the data on pin da are clocked into the shift register at the low to high transition of the clock signal cl. at the low to high transition of the ce signal the content of the internal shift register is stored into the addressed latches. the transmission is separated into bytes with 8 bit according to the data specification of the audio- processor. after every byte a positive slope of the ce signal has to be generated in order to store the data byte. a special clock counter enables the latch of the data byte only, if exactly 8 clocks were present during the low state of the ce signal. this re- sults in a high immunity against spikes on the clock line and avoids a storage of wrong databy- tes. figure 16: bus timing nr. parameter min. max. units clock frequency 250 khz 1 ce lead time 4 m s 2 clock high time 2 m s 3 clock low time 2 m s 4 data hold time 1.8 m s 5 data setup time 1.8 m s 6 clock setup time 0 m s 7 ce lagtime 0 m s 8 clock hold time 6 m s 9 ce high time 6 m s TDA7306 9/13
status after power-on-reset volume speaker audio switch bass treble -66db -38db mono +2.5db +2.5db x = don't care ax = 2db steps bx = 10db steps cx = 2.5db steps for example if you want setting the volume at -25.6db the 8 bit string is: 0 0 1 00001 software specification data bytes msb lsb function 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 b2 0 1 0 1 0 1 1 b1 b1 b1 b1 b1 x 0 1 b0 b0 b0 b0 b0 x c3 c3 a2 a2 a2 a2 a2 s2 c2 c2 a1 a1 a1 a1 a1 s1 c1 c1 a0 a0 a0 a0 a0 s0 c0 c0 volume control speaker att lf speaker att rf speaker att lr speaker att rr audio switch bass control treble control volume msb lsb 0 0 b2 b1 b0 a2 a1 a0 volume 2db steps 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 -1.6 -3.2 -4.8 -6.4 not allowed not allowed not allowed 0 0 b2 b1 b0 volume 10db steps 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 +10 +2 -8 -16 -24 -32 -40 -48 speaker attenuators msb lsb 1 1 1 1 0 0 1 1 0 1 0 1 b1 b1 b1 b1 b0 b0 b0 b0 a2 a2 a2 a2 a1 a1 a1 a1 a0 a0 a0 a0 speaker lf speaker rf speaker lr speaker rr 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 -1 -2 -4 -5 not allowed not allowed not allowed 0 0 1 1 0 1 0 1 0 -6 -18 -36 for example attenuation of 20db on speaker rf is given by: 1 0 1 10010 TDA7306 10/13
bass and treble - control range of 15db (boost and cut) steps of 2.5db 0 0 1 1 1 1 0 1 c3 c3 c2 c2 c1 c1 c0 c0 bass treble 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 1 0 1 0 1 0 1 0 -15 -15 - 12.5 -10 - 7.5 -5 - 2.5 -0 0 2.5 5 7.5 10 12.5 15 15 c3 = sign for example bass at -12.5db is obtained by the following 8 bit string: 0 1 1 0 0 0 1 0 software specification (continued) audio switch - select the input channel to activate msb lsb 0 1 0 x x s2 s1 s0 audio switch x x x x x x x x x x x x x x x x 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 stereo 1 stereo 2 stereo 3 mute input mono not allowed not allowed not allowed x = don't care for example to set the stereo 2 channel the 8 bit string must be: 0 1 0 0 0 0 0 1 TDA7306 11/13
dip28 package mechanical data dim. mm inch min. typ. max. min. typ. max. a1 0.63 0.025 b 0.45 0.018 b1 0.23 0.31 0.009 0.012 b2 1.27 0.050 d 37.34 1.470 e 15.2 16.68 0.598 0.657 e 2.54 0.100 e3 33.02 1.300 f 14.1 0.555 i 4.445 0.175 l 3.3 0.130 TDA7306 12/13
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specifications men- tioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems without ex- press written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics - all rights reserved purchase of i 2 c components of sgs-thomson microlectronics, conveys a license under the philips i 2 c patent rights to use these compo- nents in an i 2 c system, provided that the system conforms to the i 2 c standard specifications as defined by philips. sgs-thomson microelectronics group of companies australia - brazil - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thaliand - united kingdom - u.s.a. TDA7306 13/13

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